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Method for preparation of bioactive glass coatings by liquid precursor thermal spray

a technology of bioactive glass and thermal spray, which is applied in the field of biomedical materials, can solve the problems of limiting their use, affecting the mechanical properties of bioactive glass, and high brittleness and low toughness, and achieves high purity, not cracks, and high bonding strength

Inactive Publication Date: 2014-10-07
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]The objective of the present invention is to overcome the shortcomings of the air plasma spraying where the powder feedstock preparation is complicated and time-consuming, and sol-gel or other wet chemistry method where the synthesized coating generally has thin coating thickness and with low production efficiency. Therefore, a new method is provided for preparation of bioactive glass coatings.

Problems solved by technology

However, the inferior mechanical properties of bioactive glasses, such as high brittleness and low toughness, limit their usages.
However, this method also has the following shortcomings: long process time, thin coating thickness (usually about 10 μm), easy to crack, low bonding strength between the coating and substrate, complicated procedures, low productivity, unsuitable for large-scale production.
However, there are stringent requirements on the preparation of the bioactive glass powder feedstocks.
Firstly, all the oxide constituents were mixed together and melted at high temperature.
Since it is complicated and time-consuming, the process has low productivity and high cost.

Method used

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  • Method for preparation of bioactive glass coatings by liquid precursor thermal spray
  • Method for preparation of bioactive glass coatings by liquid precursor thermal spray
  • Method for preparation of bioactive glass coatings by liquid precursor thermal spray

Examples

Experimental program
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Effect test

example 1

[0102]First of all, tetraethyl orthosilicate (TEOS), triethyl phosphate (TEP), calcium nitrate (Ca(NO3)2.4H2O), sodium nitrate (NaNO3) are measured according to the amount of starting oxides: SiO2 30 wt %, P2O5 20 wt %, CaO 30 wt %, Na2O 20 wt %. Ethyl alcohol and deionized water are measured according to the following molar ratios: TEOS:EtOH=1:2, TEOS:H2O=1:8. Deionized water are also measured according to the following mass ratios: Ca(NO3)2.4H2O:H2O=1:2, NaNO3:H2O=1:1. Mix the measured tetraethyl orthosilicate and ethyl alcohol under magnetic stirring with the rotation speed of 350 rpm. Add the deionized water after 5 min stirring. Add the nitric acid to adjust the pH value to 2. Keep stirring for 10 minutes after the solution is completely pellucid. Add the triethyl phosphate and keep stirring for 5 minutes. Add the measured calcium nitrate and sodium nitrate to the deionized water. After being completely dissolved, they are added to the hydrolyzed sol. The bioactive glass precur...

example 2

[0105]First of all, tetraethyl orthosilicate (TEOS), triethyl phosphate (TEP), calcium nitrate (Ca(NO3)2.4H2O), sodium nitrate (NaNO3) are measured according to the amount of starting oxides: SiO2 45 wt %, P2O5 6 wt %, CaO 24.5 wt %, Na2O 24.5 wt %. Ethyl alcohol and deionized water are measured according to the following molar ratios: TEOS:EtOH=1:3, TEOS:H2O=1:7. Deionized water are also measured according to the following mass ratios: Ca(NO3)2.4H2O:H2O=1:1, NaNO3:H2O=1:2. Mix the measured tetraethyl orthosilicate and ethyl alcohol under magnetic stirring with the rotation speed of 400 rpm. Add the deionized water after 6 min stirring. Add the ammonia solution to adjust the pH value to 10. Keep stirring for 11 minutes after it becomes completely muddy. Add the triethyl phosphate and keep stirring for 6 minutes. Add the measured calcium nitrate and sodium nitrate to the deionized water. After being completely dissolved, they are added to the hydrolyzed suspension. The bioactive glas...

example 3

[0108]First of all, tetraethyl orthosilicate (TEOS), triethyl phosphate (TEP), calcium nitrate (Ca(NO3)2.4H2O), sodium nitrate (NaNO3), magnesium nitrate (Mg(NO3)2.6H2O) are measured according to the amount of starting oxides: SiO2 50 wt %, P2O5 5 wt %, CaO 20 wt %, Na2O 20 wt %, MgO 5 wt %. Ethyl alcohol and deionized water are measured according to the following molar ratios: TEOS:EtOH=1:4, TEOS:H2O=1:4. Deionized water are also measured according to the following mass ratios: Ca(NO3)2.4H2O:H2O=1:1, NaNO3:H2O=1:1, Mg(NO3)2.6H2O:H2O=1:2. Mix the measured tetraethyl orthosilicate and ethyl alcohol under magnetic stirring with the rotation speed of 450 rpm. Add the deionized water after 7 min stirring. Add the nitric acid to adjust the pH value to 3. Keep stirring for 12 minutes after the solution is completely pellucid. Add the triethyl phosphate and keep stirring for 7 minutes. Add the measured calcium nitrate and sodium nitrate to the deionized water. After being completely dissol...

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Abstract

The present invention belongs to the field of biomedical material, and is particularly related to a method of preparing bioactive glass coatings by liquid precursor thermal spray. The objective of the present invention is to overcome the shortcomings of the air plasma spraying where the powder feedstock preparation is complicated and time-consuming, and sol-gel or other wet chemistry method where the synthesized coating generally has thin coating thickness and with low production efficiency. Therefore, a new method is provided for preparation of bioactive glass coatings. In this method, organic and inorganic raw materials were first weighed in accordance with the chemical composition of bioactive glasses, and sol or suspension was prepared; then the sol or suspension was used as the feedstock for thermal spray, and was deposited on the biomedical materials substrate, at high temperature to form the bioactive glass coating. The invention possesses the following advantages: simple operation, less complicated procedures, synthesis with high efficiency, low production cost, suitable for industrial production, and so on. This method can be used to prepare bioactive glass coatings.

Description

FIELD OF INVENTION[0001]The present invention belongs to the field of biomedical material, and is particularly related to a method of preparing bioactive glass coatings by liquid precursor thermal spray.BACKGROUND OF THE INVENTION[0002]Bioactive glass was first invented by Hench and collaborators at the University of Florida in 1971 (L. L. Hench, R. J. Splinter, W. C. Allen, J. Biomed. Mater. Res. Symp., 1971, (2):117˜141). Bioactive glass not only possesses excellent bioactivity, but also has favorable bonding to bone and soft tissue. Furthermore, it holds long-term security and stability when being implanted into body as an artificial bone replacement material. Therefore, bioactive glasses have great potential in dental, orthopedic, otology, and restoration applications (L. L. Hench, Bioceramics, J. Am. Ceram. Soc., 1998, (81):1705˜1728). At present, bioactive glasses have received the approval from the U.S. Food and Drug Administration (FDA). However, the inferior mechanical prop...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): A61L33/00A61L27/32C03C1/00C03C3/062C03C3/097C03C3/112C03C4/00C23C4/12C23C18/12
CPCC23C4/121C23C18/1258C03C1/008C23C18/1245C23C18/1212C03C4/0007C03C3/112A61L27/32C03C3/062C23C18/1254C03C3/097A61L2420/02C23C4/123
Inventor WU, FANGXIAO, YANFENGSONG, LEILIU, XIAOGUANGHUANG, YIHUANG, TAOFENG, JIAMIN
Owner SICHUAN UNIV
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